US6843341B2 - Method of controlling a power steering system - Google Patents

Method of controlling a power steering system Download PDF

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Publication number
US6843341B2
US6843341B2 US10/121,429 US12142902A US6843341B2 US 6843341 B2 US6843341 B2 US 6843341B2 US 12142902 A US12142902 A US 12142902A US 6843341 B2 US6843341 B2 US 6843341B2
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US
United States
Prior art keywords
adjusting mechanism
end position
steering
approaching
drive means
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime, expires
Application number
US10/121,429
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English (en)
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US20020166319A1 (en
Inventor
Kai Grebe
Ulrich Wienecke
Jochen Gessat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TRW Fahrwerksysteme GmbH and Co KG
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TRW Fahrwerksysteme GmbH and Co KG
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Assigned to TRW FAHRWERKSYSTEME GMBH & CO. KG reassignment TRW FAHRWERKSYSTEME GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GESSAT, JOCHEN, GREBE, KAI, WIENECKE, ULRICH
Publication of US20020166319A1 publication Critical patent/US20020166319A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/065—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist

Definitions

  • Such a power steering system normally has an adjusting mechanism that can swivel at least one vehicle wheel via a steering linkage, a steering wheel that is coupled to the adjusting mechanism and predefines a set point for the steering direction, as well as a drive means to provide steering assistance so as to reduce the torque that has to be applied to the steering wheel in order to adjust the vehicle wheel.
  • the drive means normally provided is a servo pump that is driven by an electric motor and that provides a hydraulic oil flow.
  • the drive means provided is an electric motor that is coupled to the adjusting mechanism.
  • a hydraulic power steering system In order to prevent the adjusting mechanism from striking against an end stop at high speed after a full steering wheel turn angle, a hydraulic power steering system normally has stop valves that are opened when the piston of a hydraulic cylinder, in which the hydraulic oil flow is converted into a steering assistance force, approaches an end position. In this manner, the pressure in the hydraulic cylinder is reduced in time so that the reaching of the end position does not result in excessive mechanical stress and corresponding wear and tear.
  • the object of the invention is to provide a method of controlling a power steering system in which there can be prevented with low expenditure that the adjusting mechanism reaches an end position with a high steering assistance force.
  • a method of controlling a power steering system including an adjusting mechanism for adjusting at least one vehicle wheel, a drive means to provide steering assistance, a steering wheel and a position sensor.
  • the method comprises the following steps: it is determined whether the adjusting mechanism is approaching an end position. If it is found that the adjusting mechanism is approaching the end position, then the drive means is controlled in such a way that it provides diminishing steering assistance.
  • the steering assistance can be regulated in such a way that, by reducing the supplied steering assistance force at an appropriately early point in time, the adjustment speed of the adjusting mechanism is diminished shortly before the end position is reached.
  • the position sensor detects the absolute position of the adjusting mechanism. Suitable sensors for the adjusting mechanism that detect the absolute angular position are known and are already used for other functions, for example, for electronic stability control systems. Consequently, no additional design work is required. As an alternative, it can also be provided that the position sensor detects the distance from an end position. For this purpose, simpler mechanical sensors are sufficient.
  • the adjustment speed determined by the position sensor is polled in order to determine the speed at which the adjusting mechanism is approaching the end position. In this manner, it is possible to determine how quickly the drive means has to be regulated down, on the one hands in order to reduce the supplied steering assistance force in time before the mechanism reaches the end position and, on the other hand, in order not to restrict the available adjustment range of the adjusting mechanism as a result of premature regulating down.
  • the speed of the electric motor is preferably regulated down when it is detected that the adjusting mechanism is approaching an end position.
  • the drive means is an electric motor, indicated schematically at 50 , that is directly coupled to the adjusting mechanism, the steering assistance torque of the electric motor is preferably regulated down when it is detected that the adjusting mechanism is approaching an end position.
  • the single FIGURE schematically shows a steering system according to the invention.
  • the invention will be described below with reference to a preferred embodiment which is shown in the FIGURE.
  • the system according to the invention is configured here as an electro-hydraulic steering system without a mechanical connection between the steering wheel, schematically illustrated in the FIGURE at 11 , and the vehicle wheels.
  • the invention can likewise be used in steering systems that have a mechanical steering mechanism and additionally an electric or electro-hydraulic power-assisted steering system.
  • the electro-hydraulic steering system comprises, as its adjusting mechanism, a servo cylinder 10 with a piston 12 that divides the interior of the cylinder into two chambers 14 , 16 .
  • a piston 12 that divides the interior of the cylinder into two chambers 14 , 16 .
  • the piston rod 18 is connected to steerable vehicle wheels (not shown in the FIGURE) so that, by adjusting the piston 12 in the servo cylinder 10 , a steering assistance force can be transmitted to the vehicle wheels.
  • a servo pump 20 that is driven by an electric motor 22 .
  • the servo pump 20 can be run in two conveying directions. One side of the pump 20 is connected via a pressure line 24 to the first chamber 14 of the servo cylinder 10 , and the other side of the pump 22 is connected via a pressure line 26 to the second chamber 16 . In this manner, a closed system is formed that is filled with a hydraulic fluid.
  • a hydraulic reservoir 28 is provided that is filled with hydraulic fluid being subject to a pressure that corresponds to about half of the maximum hydraulic pressure in the hydraulic system, the latter consisting of the two chambers 14 , 16 , of the two pressure lines 24 , 26 and of the servo pump 20 .
  • the reservoir 28 is connected to the hydraulic system via a charging valve 30 and a check valve 32 so that the hydraulic system is kept under the pressure that prevails in the reservoir 28 .
  • the electric motor 22 is controlled by an electronic control unit 34 .
  • Set points for the steering angle and the steering torque as well as the actual value of the steering torque and of the steering angle are transmitted to the control unit 34 .
  • a steering wheel sensor is provided (not shown in the FIGURE).
  • the control unit 34 receives a parameter that corresponds to the steering angle or to the travel of the servo cylinder.
  • a position sensor 36 that detects the absolute position of the adjusting mechanism here. If a steering system with a rigid mechanical coupling between the steering wheel and the steering mechanism is used, the absolute angle position of the steering wheel can also be detected by a steering angle sensor, as an alternative.
  • the steering system functions as follows: when the control unit 34 recognizes that steering assistance has to be supplied, for example, on the basis of the set point for the steering angle that can be detected on a vehicle steering wheel, or on the basis of the difference between the set point and the actual value for the steering torque, the servo pump 20 is run in the appropriate direction in order to suitably pressurize one or the other of the two chambers 14 , 16 .
  • This pressure is immediately available since the hydraulic system is pre-pressurized by the reservoir 28 ; consequently, the servo pump 20 does not first have to build up a system pressure immediately after starting up.
  • the electric motor 22 is switched off again so that the servo pump 20 stops.
  • the control unit checks with the aid of the position sensor 36 at regular intervals to ascertain whether the servo cylinder 10 is approaching an end position, that is to say, whether the piston 12 is approaching the end face of one of the chambers 14 , 16 . If such a state is detected, then the electric motor 22 is regulated down by the control unit in such a way that the servo pump provides diminishing steering assistance. Preferably, the steering assistance drops to zero just before the end position is reached.
  • the drive means includes a servo pump that is driven by an electric motor, wherein an electronic pressure limiting valve, indicated schematically at 40 , is opened when it is detected that the adjusting mechanism is approaching the end position.
  • the speed at which the piston is approaching the end position is determined by evaluating the adjustment speed of the piston in the servo cylinder. If the piston is approaching the end position at a high speed, the steering assistance has to be diminished fairly abruptly. If the piston is approaching the end position at a low speed, the steering assistance can be diminished gradually, resulting in a comfortable end position damping.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
US10/121,429 2001-04-17 2002-04-12 Method of controlling a power steering system Expired - Lifetime US6843341B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10118739.4 2001-04-17
DE10118739A DE10118739A1 (de) 2001-04-17 2001-04-17 Verfahren zum Steuern eines Servolenksystems

Publications (2)

Publication Number Publication Date
US20020166319A1 US20020166319A1 (en) 2002-11-14
US6843341B2 true US6843341B2 (en) 2005-01-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/121,429 Expired - Lifetime US6843341B2 (en) 2001-04-17 2002-04-12 Method of controlling a power steering system

Country Status (4)

Country Link
US (1) US6843341B2 (de)
EP (1) EP1251059B1 (de)
JP (1) JP4115156B2 (de)
DE (2) DE10118739A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130268161A1 (en) * 2012-04-10 2013-10-10 Jtekt Corporation Hydraulic power steering system
USD809892S1 (en) * 2016-10-21 2018-02-13 Wubbers, Llc Inverted triangle texture hammer
US9950735B2 (en) * 2013-06-04 2018-04-24 Jtekt Europe Use of a power-steering motor to simulate an end-of-travel stop for said steering
US10800446B2 (en) 2018-05-01 2020-10-13 Ford Global Technologies, Llc Methods and apparatus to modify steering assist of a hydraulic power steering system
US20240227929A9 (en) * 2021-02-18 2024-07-11 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Pump Apparatus and Electrohydraulic Power Steering Mechanism for a Vehicle

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2850076B1 (fr) * 2003-01-16 2005-02-11 Soc Mecanique Irigny Dispositif de protection des butees de fin de course d'une direction assistee electrique
JP4669800B2 (ja) * 2006-03-09 2011-04-13 日立オートモティブシステムズ株式会社 パワーステアリング装置
DE102006033655A1 (de) * 2006-07-20 2008-02-14 Trw Automotive Gmbh Hydraulische Servolenkung sowie Verfahren zur Steuerung einer solchen Servolenkung
FR2917043B1 (fr) * 2007-06-08 2010-01-22 Renault Sas Procede de pilotage d'un moteur de pivotement des roues d'un vehicule automobile et dispositif de protection des butees de fin de course de pivotement des roues mettant en oeuvre le procede
US7973504B2 (en) * 2007-07-27 2011-07-05 GM Global Technology Operations LLC Electric power steering control
DE102007045896A1 (de) * 2007-09-26 2009-04-09 Trw Automotive Gmbh Fahrzeuglenksystem
DE102007053263A1 (de) * 2007-11-08 2009-05-14 Trw Automotive Gmbh Elektrohydraulisches Fahrzeuglenksystem
DE102010043679B4 (de) * 2010-11-10 2024-02-01 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Betriebsverfahren für ein hydraulisches Servo-Lenksystem und hydraulisches Servo-Lenksystem
DE102012021207A1 (de) * 2012-10-30 2014-04-30 Weber-Hydraulik Gmbh Hydrostatische Stellschaltung sowie deren Verwendung
CN107107952B (zh) 2014-12-25 2019-09-10 日本精工株式会社 电动助力转向装置
WO2016104570A1 (ja) 2014-12-25 2016-06-30 日本精工株式会社 電動パワーステアリング装置
EP3222497B1 (de) 2014-12-25 2019-09-11 NSK Ltd. Elektrische servolenkvorrichtung
EP3196098B1 (de) 2014-12-25 2019-06-05 NSK Ltd. Elektrische servolenkvorrichtung
JP6663331B2 (ja) * 2016-09-20 2020-03-11 クノールブレムゼステアリングシステムジャパン株式会社 パワーステアリング装置
EP3514040A4 (de) 2017-11-22 2020-04-08 NSK Ltd. Steuerungsvorrichtung für elektrische servolenkvorrichtung
DE102018125049B4 (de) * 2018-10-10 2020-08-20 Danfoss Power Solutions Aps Hydraulische Lenkanordnung
EP3808639B1 (de) 2018-12-14 2022-05-04 Nsk Ltd. Elektrische servolenkvorrichtung

Citations (18)

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Publication number Priority date Publication date Assignee Title
US4354422A (en) * 1979-04-19 1982-10-19 Honda Giken Kogyo Kabushiki Kaisha Load relief device for power steering system
DE3539607A1 (de) 1985-11-08 1987-05-21 Daimler Benz Ag Lenkvorrichtung mit hilfskraftunterstuetzung fuer fahrzeuge, bei der ein zentrales lenkbegrenzungsventil mit der pumpendruckleitung einer lenkhelfpumpe verbunden ist
DE3723770A1 (de) 1986-07-17 1988-01-21 Tokai Trw & Co Lenkhilfe-mechanismus mit elektrischem antrieb, insbesondere fuer zahnstangenlenkungen
US5267627A (en) * 1992-03-27 1993-12-07 Imra America, Inc. Vehicle stability augmentation system
US5279380A (en) * 1992-03-27 1994-01-18 Imra America, Inc. Hydrostatic power steering system
US5314036A (en) 1991-01-21 1994-05-24 Toyota Jidosha Kabushiki Kaisha Steering angle sensor
WO1997008036A1 (en) 1995-08-29 1997-03-06 Ab Volvo Steering gear device
DE19754278A1 (de) 1996-12-05 1998-06-10 Hyundai Motor Co Ltd Kfz-Servolenksystem
DE19713576A1 (de) 1997-04-02 1998-10-08 Bosch Gmbh Robert Verfahren und Vorrichtung zum Betrieb eines Lenksystems für ein Kraftfahrzeug
DE19832728A1 (de) 1997-09-12 1999-03-25 Steyr Nutzfahrzeuge Nutzfahrzeuge mit Servolenkung und Radeinschlagbegrenzungseinrichtung
EP0962377A2 (de) 1998-06-01 1999-12-08 Ford Global Technologies, Inc. Verfahren zum Begrenzen der hydraulischen Hilfskraft in einem Servolenksystem
DE29920122U1 (de) 1999-11-16 2000-03-23 TRW Fahrwerksysteme GmbH & Co KG, 40547 Düsseldorf Elektro-hydraulisches Lenksystem
DE19852061A1 (de) 1998-11-11 2000-05-18 Mercedes Benz Lenkungen Gmbh Ventilanordnung für Servolenkungen
US20010026613A1 (en) 1997-04-02 2001-10-04 Robert Bosch Gmbh Arrangment for operating a steering system for motor vehicle
US6298941B1 (en) * 1999-01-29 2001-10-09 Dana Corp Electro-hydraulic power steering system
US20020148670A1 (en) * 2001-02-23 2002-10-17 Armin Schymczyk Hydraulically supported steering system
US20020170769A1 (en) * 2001-05-17 2002-11-21 Unisia Jecs Corporation Power steering device
JP2003231477A (ja) * 2002-02-08 2003-08-19 Hitachi Unisia Automotive Ltd パワーステアリング装置

Patent Citations (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4354422A (en) * 1979-04-19 1982-10-19 Honda Giken Kogyo Kabushiki Kaisha Load relief device for power steering system
DE3539607A1 (de) 1985-11-08 1987-05-21 Daimler Benz Ag Lenkvorrichtung mit hilfskraftunterstuetzung fuer fahrzeuge, bei der ein zentrales lenkbegrenzungsventil mit der pumpendruckleitung einer lenkhelfpumpe verbunden ist
US4683972A (en) 1985-11-08 1987-08-04 Daimler-Benz Aktiengesellschaft Steering system with auxiliary force assist for vehicles in which a central steering limit valve is connected with the pump pressure line of a steering assist pump
DE3723770A1 (de) 1986-07-17 1988-01-21 Tokai Trw & Co Lenkhilfe-mechanismus mit elektrischem antrieb, insbesondere fuer zahnstangenlenkungen
US4785901A (en) 1986-07-17 1988-11-22 Tokai Trw & Co. Ltd. Rack and pinion steering gear with electric power assistance
US5314036A (en) 1991-01-21 1994-05-24 Toyota Jidosha Kabushiki Kaisha Steering angle sensor
US5267627A (en) * 1992-03-27 1993-12-07 Imra America, Inc. Vehicle stability augmentation system
US5279380A (en) * 1992-03-27 1994-01-18 Imra America, Inc. Hydrostatic power steering system
WO1997008036A1 (en) 1995-08-29 1997-03-06 Ab Volvo Steering gear device
DE19754278A1 (de) 1996-12-05 1998-06-10 Hyundai Motor Co Ltd Kfz-Servolenksystem
DE19713576A1 (de) 1997-04-02 1998-10-08 Bosch Gmbh Robert Verfahren und Vorrichtung zum Betrieb eines Lenksystems für ein Kraftfahrzeug
US20010026613A1 (en) 1997-04-02 2001-10-04 Robert Bosch Gmbh Arrangment for operating a steering system for motor vehicle
DE19832728A1 (de) 1997-09-12 1999-03-25 Steyr Nutzfahrzeuge Nutzfahrzeuge mit Servolenkung und Radeinschlagbegrenzungseinrichtung
EP0962377A2 (de) 1998-06-01 1999-12-08 Ford Global Technologies, Inc. Verfahren zum Begrenzen der hydraulischen Hilfskraft in einem Servolenksystem
US6073721A (en) * 1998-06-01 2000-06-13 Ford Global Technologies, Inc. Method for limiting hydraulic assist in a power assist steering system
DE19852061A1 (de) 1998-11-11 2000-05-18 Mercedes Benz Lenkungen Gmbh Ventilanordnung für Servolenkungen
US6345682B1 (en) 1998-11-11 2002-02-12 Mercedes Benz Lenkungen Gmbh Valve arrangement for power-assisted steering systems
US6298941B1 (en) * 1999-01-29 2001-10-09 Dana Corp Electro-hydraulic power steering system
DE29920122U1 (de) 1999-11-16 2000-03-23 TRW Fahrwerksysteme GmbH & Co KG, 40547 Düsseldorf Elektro-hydraulisches Lenksystem
US6488112B1 (en) 1999-11-16 2002-12-03 Trw Fahrwerksysteme Gmbh & Co. Kg Electrohydraulic steering system
US20020148670A1 (en) * 2001-02-23 2002-10-17 Armin Schymczyk Hydraulically supported steering system
US20020170769A1 (en) * 2001-05-17 2002-11-21 Unisia Jecs Corporation Power steering device
JP2003231477A (ja) * 2002-02-08 2003-08-19 Hitachi Unisia Automotive Ltd パワーステアリング装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130268161A1 (en) * 2012-04-10 2013-10-10 Jtekt Corporation Hydraulic power steering system
US9079609B2 (en) * 2012-04-10 2015-07-14 Jtekt Corporation Hydraulic power steering system
US9950735B2 (en) * 2013-06-04 2018-04-24 Jtekt Europe Use of a power-steering motor to simulate an end-of-travel stop for said steering
USD809892S1 (en) * 2016-10-21 2018-02-13 Wubbers, Llc Inverted triangle texture hammer
USD809890S1 (en) * 2016-10-21 2018-02-13 Wubbers, Llc Triangle texture hammer
US10800446B2 (en) 2018-05-01 2020-10-13 Ford Global Technologies, Llc Methods and apparatus to modify steering assist of a hydraulic power steering system
US20240227929A9 (en) * 2021-02-18 2024-07-11 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Pump Apparatus and Electrohydraulic Power Steering Mechanism for a Vehicle
US12559169B2 (en) * 2021-02-18 2026-02-24 Knorr-Bremse Systeme Fuer Nutzfahrzeuge Gmbh Pump apparatus and electrohydraulic power steering mechanism for a vehicle

Also Published As

Publication number Publication date
US20020166319A1 (en) 2002-11-14
EP1251059A1 (de) 2002-10-23
EP1251059B1 (de) 2004-11-03
JP4115156B2 (ja) 2008-07-09
DE10118739A1 (de) 2002-11-14
DE50201431D1 (de) 2004-12-09
JP2002356169A (ja) 2002-12-10

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